most med students could not get into a pa program because they lack the required clinical hours as an rn/emt-p/r.t. , etc.
pa programs want people who are already medical professionals.
it would be easier to get an mph(2 years) then get trained for instance as a paramedic( 1-2 years), work for 2 years to get the clinical hours, then apply to a pa program which would then take 2 years(total around 5-6 years).
by the way, many pa programs are now taught at the graduate level and the majority will be by 2008.